Error in Serial Communication (F28027 + DRV8301) PMSM fault diagnosis - Programming TI C2000 LaunchPad with Simulink

(Reference : https://kr.mathworks.com/videos/programming-ti-c2000-launchpad-with-simulink-89507.html?s_tid=srchtitle)

Hello!

I want to do ac+dc field excitation in the d-axis (stator)

First, I tried to do Serial Communication.

I tried to apply 750 to each of PWM modules(TI instrument PWM module 1, 2, 3) for switching off the current.

(PWM Counter Period = 1500 & Up&Down Counter)

I use 12-bit Microcontroller, so range will be 0~4095(2^12 - 1)

Also I switched off the current, so serial Communication have to show me 2048 +- a (measure current_A phase)

But it showed 460 +- a (measure current_A phase)

I want to know what happen in my model. Do I make wrong model?

Thank you!

Fig 1 = Model Fig2 = ADC-PWM Subsystem Fig3 = Serial Communication Fig4 = Result